1 /* 2 * Copyright 2001 MontaVista Software Inc. 3 * Author: Matt Porter <mporter@mvista.com> 4 * 5 * Copyright (C) 2009 Lemote, Inc. 6 * Author: Wu Zhangjin <wuzhangjin@gmail.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 */ 13 14 #include <linux/types.h> 15 #include <linux/kernel.h> 16 #include <linux/string.h> 17 18 #include <asm/addrspace.h> 19 20 /* 21 * These two variables specify the free mem region 22 * that can be used for temporary malloc area 23 */ 24 unsigned long free_mem_ptr; 25 unsigned long free_mem_end_ptr; 26 27 /* The linker tells us where the image is. */ 28 extern unsigned char __image_begin, __image_end; 29 30 /* debug interfaces */ 31 #ifdef CONFIG_DEBUG_ZBOOT 32 extern void puts(const char *s); 33 extern void puthex(unsigned long long val); 34 #else 35 #define puts(s) do {} while (0) 36 #define puthex(val) do {} while (0) 37 #endif 38 39 void error(char *x) 40 { 41 puts("\n\n"); 42 puts(x); 43 puts("\n\n -- System halted"); 44 45 while (1) 46 ; /* Halt */ 47 } 48 49 /* activate the code for pre-boot environment */ 50 #define STATIC static 51 52 #ifdef CONFIG_KERNEL_GZIP 53 #include "../../../../lib/decompress_inflate.c" 54 #endif 55 56 #ifdef CONFIG_KERNEL_BZIP2 57 #include "../../../../lib/decompress_bunzip2.c" 58 #endif 59 60 #ifdef CONFIG_KERNEL_LZ4 61 #include "../../../../lib/decompress_unlz4.c" 62 #endif 63 64 #ifdef CONFIG_KERNEL_LZMA 65 #include "../../../../lib/decompress_unlzma.c" 66 #endif 67 68 #ifdef CONFIG_KERNEL_LZO 69 #include "../../../../lib/decompress_unlzo.c" 70 #endif 71 72 #ifdef CONFIG_KERNEL_XZ 73 #include "../../../../lib/decompress_unxz.c" 74 #endif 75 76 unsigned long __stack_chk_guard; 77 78 void __stack_chk_guard_setup(void) 79 { 80 __stack_chk_guard = 0x000a0dff; 81 } 82 83 void __stack_chk_fail(void) 84 { 85 error("stack-protector: Kernel stack is corrupted\n"); 86 } 87 88 void decompress_kernel(unsigned long boot_heap_start) 89 { 90 unsigned long zimage_start, zimage_size; 91 92 __stack_chk_guard_setup(); 93 94 zimage_start = (unsigned long)(&__image_begin); 95 zimage_size = (unsigned long)(&__image_end) - 96 (unsigned long)(&__image_begin); 97 98 puts("zimage at: "); 99 puthex(zimage_start); 100 puts(" "); 101 puthex(zimage_size + zimage_start); 102 puts("\n"); 103 104 /* This area are prepared for mallocing when decompressing */ 105 free_mem_ptr = boot_heap_start; 106 free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE; 107 108 /* Display standard Linux/MIPS boot prompt */ 109 puts("Uncompressing Linux at load address "); 110 puthex(VMLINUX_LOAD_ADDRESS_ULL); 111 puts("\n"); 112 113 /* Decompress the kernel with according algorithm */ 114 __decompress((char *)zimage_start, zimage_size, 0, 0, 115 (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, 0, error); 116 117 /* FIXME: should we flush cache here? */ 118 puts("Now, booting the kernel...\n"); 119 } 120